The difference is that Christ forgives.
To be forgiven, you have to repent. With a gang of 'helpful' therapists around telling him it's fine, how is he even going to know it's a sin, let alone repent of it?
Were that the case, only Jesus Himself would have been saved.
Jesus did not need to be saved. He is the Savior.
In fact, I know of no religion that suggests you can be damned for a single sin.
You must go to a more liberal church than I do. One mortal sin, yes just one, separates you from the grace of God, until such time as you repent, confess & are forgiven.
Add Christianity to your list for my Book says the wages of sin is death!
"There is none righteous, no, not one;One sin was so bad that it condemned the earth and everything in it. Even worse, this one single sin has so corrupted man that he is incapable of doing any good. Unless a man finds an answer to this burden on his back, he will utterly perish forever.
There is none who understands;
There is none who seeks after God.
They have all turned aside;
They have together become unprofitable;
There is none who does good, no, not one."